1 /*************************************************************************
2 Copyright (c) 2003-2007 Cavium Networks (support@cavium.com). All rights
6 Redistribution and use in source and binary forms, with or without
7 modification, are permitted provided that the following conditions are
10 * Redistributions of source code must retain the above copyright
11 notice, this list of conditions and the following disclaimer.
13 * Redistributions in binary form must reproduce the above
14 copyright notice, this list of conditions and the following
15 disclaimer in the documentation and/or other materials provided
16 with the distribution.
18 * Neither the name of Cavium Networks nor the names of
19 its contributors may be used to endorse or promote products
20 derived from this software without specific prior written
23 This Software, including technical data, may be subject to U.S. export control laws, including the U.S. Export Administration Act and its associated regulations, and may be subject to export or import regulations in other countries.
25 TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
26 AND WITH ALL FAULTS AND CAVIUM NETWORKS MAKES NO PROMISES, REPRESENTATIONS OR WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH RESPECT TO THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY REPRESENTATION OR DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT DEFECTS, AND CAVIUM SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES OF TITLE, MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR PURPOSE, LACK OF VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT, QUIET POSSESSION OR CORRESPONDENCE TO DESCRIPTION. THE ENTIRE RISK ARISING OUT OF USE OR PERFORMANCE OF THE SOFTWARE LIES WITH YOU.
28 *************************************************************************/
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
34 #include <sys/systm.h>
36 #include <sys/endian.h>
37 #include <sys/kernel.h>
39 #include <sys/socket.h>
41 #include <sys/sched.h>
43 #include <sys/taskqueue.h>
45 #include <net/ethernet.h>
48 #include "wrapper-cvmx-includes.h"
49 #include "ethernet-headers.h"
51 extern int pow_receive_group;
52 extern struct ifnet *cvm_oct_device[];
54 static struct task cvm_oct_task;
55 static struct taskqueue *cvm_oct_taskq;
57 static int cvm_oct_rx_active;
60 * Interrupt handler. The interrupt occurs whenever the POW
61 * transitions from 0->1 packets in our group.
68 int cvm_oct_do_interrupt(void *dev_id)
70 /* Acknowledge the interrupt */
72 cvmx_write_csr(CVMX_POW_WQ_INT, 1<<pow_receive_group);
74 cvmx_write_csr(CVMX_POW_WQ_INT, 0x10001<<pow_receive_group);
77 * Schedule task if there isn't one running.
79 if (atomic_cmpset_int(&cvm_oct_rx_active, 0, 1))
80 taskqueue_enqueue(cvm_oct_taskq, &cvm_oct_task);
82 return FILTER_HANDLED;
87 * This is called on receive errors, and determines if the packet
88 * can be dropped early-on in cvm_oct_tasklet_rx().
90 * @param work Work queue entry pointing to the packet.
91 * @return Non-zero if the packet can be dropped, zero otherwise.
93 static inline int cvm_oct_check_rcv_error(cvmx_wqe_t *work)
95 if ((work->word2.snoip.err_code == 10) && (work->word1.s.len <= 64)) {
96 /* Ignore length errors on min size packets. Some equipment
97 incorrectly pads packets to 64+4FCS instead of 60+4FCS.
98 Note these packets still get counted as frame errors. */
100 if (USE_10MBPS_PREAMBLE_WORKAROUND && ((work->word2.snoip.err_code == 5) || (work->word2.snoip.err_code == 7))) {
102 /* We received a packet with either an alignment error or a
103 FCS error. This may be signalling that we are running
104 10Mbps with GMXX_RXX_FRM_CTL[PRE_CHK} off. If this is the
105 case we need to parse the packet to determine if we can
106 remove a non spec preamble and generate a correct packet */
107 int interface = cvmx_helper_get_interface_num(work->word1.cn38xx.ipprt);
108 int index = cvmx_helper_get_interface_index_num(work->word1.cn38xx.ipprt);
109 cvmx_gmxx_rxx_frm_ctl_t gmxx_rxx_frm_ctl;
110 gmxx_rxx_frm_ctl.u64 = cvmx_read_csr(CVMX_GMXX_RXX_FRM_CTL(index, interface));
111 if (gmxx_rxx_frm_ctl.s.pre_chk == 0) {
113 uint8_t *ptr = cvmx_phys_to_ptr(work->packet_ptr.s.addr);
116 while (i < work->word1.s.len-1) {
125 DEBUGPRINT("Port %d received 0xd5 preamble\n", work->word1.cn38xx.ipprt);
127 work->packet_ptr.s.addr += i+1;
128 work->word1.s.len -= i+5;
130 if ((*ptr & 0xf) == 0xd) {
132 DEBUGPRINT("Port %d received 0x?d preamble\n", work->word1.cn38xx.ipprt);
134 work->packet_ptr.s.addr += i;
135 work->word1.s.len -= i+4;
136 for (i = 0; i < work->word1.s.len; i++) {
137 *ptr = ((*ptr&0xf0)>>4) | ((*(ptr+1)&0xf)<<4);
141 DEBUGPRINT("Port %d unknown preamble, packet dropped\n", work->word1.cn38xx.ipprt);
143 cvmx_helper_dump_packet(work);
145 cvm_oct_free_work(work);
150 DEBUGPRINT("Port %d receive error code %d, packet dropped\n", work->word1.cn38xx.ipprt, work->word2.snoip.err_code);
151 cvm_oct_free_work(work);
159 * Tasklet function that is scheduled on a core when an interrupt occurs.
163 void cvm_oct_tasklet_rx(void *context, int pending)
166 uint64_t old_group_mask;
170 int packet_not_copied;
173 coreid = cvmx_get_core_num();
175 /* Prefetch cvm_oct_device since we know we need it soon */
176 CVMX_PREFETCH(cvm_oct_device, 0);
178 /* Only allow work for our group (and preserve priorities) */
179 old_group_mask = cvmx_read_csr(CVMX_POW_PP_GRP_MSKX(coreid));
180 cvmx_write_csr(CVMX_POW_PP_GRP_MSKX(coreid),
181 (old_group_mask & ~0xFFFFull) | 1<<pow_receive_group);
184 struct mbuf *m = NULL;
188 if ((INTERRUPT_LIMIT == 0) || (rx_count < MAX_RX_PACKETS))
189 work = cvmx_pow_work_request_sync(CVMX_POW_NO_WAIT);
192 CVMX_PREFETCH(work, 0);
196 mbuf_in_hw = work->word2.s.bufs == 1;
198 m = *(struct mbuf **)(cvm_oct_get_buffer_ptr(work->packet_ptr) - sizeof(void *));
199 CVMX_PREFETCH(m, offsetof(struct mbuf, m_data));
200 CVMX_PREFETCH(m, offsetof(struct mbuf, m_pkthdr));
202 CVMX_PREFETCH(cvm_oct_device[work->word1.cn38xx.ipprt], 0);
203 //CVMX_PREFETCH(m, 0);
207 /* Immediately throw away all packets with receive errors */
208 if ((work->word2.snoip.rcv_error)) {
209 if (cvm_oct_check_rcv_error(work))
213 /* We can only use the zero copy path if mbufs are in the FPA pool
214 and the packet fits in a single buffer */
216 CVMX_PREFETCH(m->m_data, 0);
218 m->m_pkthdr.len = m->m_len = work->word1.s.len;
220 packet_not_copied = 1;
223 * Adjust the data pointer based on the offset
224 * of the packet within the buffer.
226 m->m_data += (work->packet_ptr.s.back << 7) + (work->packet_ptr.s.addr & 0x7f);
229 /* We have to copy the packet. First allocate an
231 MGETHDR(m, M_NOWAIT, MT_DATA);
233 DEBUGPRINT("Port %d failed to allocate mbuf, packet dropped\n", work->word1.cn38xx.ipprt);
234 cvm_oct_free_work(work);
238 /* Check if we've received a packet that was entirely
239 stored in the work entry. This is untested */
240 if ((work->word2.s.bufs == 0)) {
241 uint8_t *ptr = work->packet_data;
243 if (cvmx_likely(!work->word2.s.not_IP)) {
244 /* The beginning of the packet moves
246 if (work->word2.s.is_v6)
251 panic("%s: not yet implemented; copy in small packet.", __func__);
252 /* No packet buffers to free */
254 int segments = work->word2.s.bufs;
255 cvmx_buf_ptr_t segment_ptr = work->packet_ptr;
256 int len = work->word1.s.len;
259 cvmx_buf_ptr_t next_ptr = *(cvmx_buf_ptr_t *)cvmx_phys_to_ptr(segment_ptr.s.addr-8);
260 /* Octeon Errata PKI-100: The segment
261 size is wrong. Until it is fixed,
262 calculate the segment size based on
263 the packet pool buffer size. When
264 it is fixed, the following line
265 should be replaced with this one:
266 int segment_size = segment_ptr.s.size; */
267 int segment_size = CVMX_FPA_PACKET_POOL_SIZE - (segment_ptr.s.addr - (((segment_ptr.s.addr >> 7) - segment_ptr.s.back) << 7));
268 /* Don't copy more than what is left
270 if (segment_size > len)
272 /* Copy the data into the packet */
273 panic("%s: not yet implemented; copy in packet segments.", __func__);
275 memcpy(m_put(m, segment_size), cvmx_phys_to_ptr(segment_ptr.s.addr), segment_size);
277 /* Reduce the amount of bytes left
280 segment_ptr = next_ptr;
283 packet_not_copied = 0;
286 if (((work->word1.cn38xx.ipprt < TOTAL_NUMBER_OF_PORTS) &&
287 cvm_oct_device[work->word1.cn38xx.ipprt])) {
288 struct ifnet *ifp = cvm_oct_device[work->word1.cn38xx.ipprt];
290 /* Only accept packets for devices
291 that are currently up */
292 if ((ifp->if_flags & IFF_UP)) {
293 m->m_pkthdr.rcvif = ifp;
295 if ((ifp->if_capenable & IFCAP_RXCSUM) != 0) {
296 if ((work->word2.s.not_IP || work->word2.s.IP_exc || work->word2.s.L4_error))
297 m->m_pkthdr.csum_flags = 0; /* XXX */
299 m->m_pkthdr.csum_flags = CSUM_IP_CHECKED | CSUM_IP_VALID | CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
300 m->m_pkthdr.csum_data = 0xffff;
303 m->m_pkthdr.csum_flags = 0; /* XXX */
308 (*ifp->if_input)(ifp, m);
310 /* Drop any packet received for a device that isn't up */
312 DEBUGPRINT("%s: Device not up, packet dropped\n",
318 /* Drop any packet received for a device that
320 DEBUGPRINT("Port %d not controlled by FreeBSD, packet dropped\n", work->word1.cn38xx.ipprt);
324 /* Check to see if the mbuf and work share
325 the same packet buffer */
326 if ((packet_not_copied)) {
327 /* This buffer needs to be replaced, increment
328 the number of buffers we need to free by one */
329 cvmx_fau_atomic_add32(
330 FAU_NUM_PACKET_BUFFERS_TO_FREE, 1);
332 cvmx_fpa_free(work, CVMX_FPA_WQE_POOL,
335 cvm_oct_free_work(work);
339 * If we hit our limit, schedule another task while we clean up.
341 if (INTERRUPT_LIMIT != 0 && rx_count == MAX_RX_PACKETS) {
342 taskqueue_enqueue(cvm_oct_taskq, &cvm_oct_task);
345 * No more packets, all done.
347 if (!atomic_cmpset_int(&cvm_oct_rx_active, 1, 0))
348 panic("%s: inconsistent rx active state.", __func__);
351 /* Restore the original POW group mask */
352 cvmx_write_csr(CVMX_POW_PP_GRP_MSKX(coreid), old_group_mask);
354 /* Refill the packet buffer pool */
356 cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);
358 if (number_to_free > 0) {
359 cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE,
362 cvm_oct_mem_fill_fpa(CVMX_FPA_PACKET_POOL,
363 CVMX_FPA_PACKET_POOL_SIZE,
365 if (num_freed != number_to_free) {
366 cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE,
367 number_to_free - num_freed);
375 void cvm_oct_rx_initialize(void)
377 TASK_INIT(&cvm_oct_task, 0, cvm_oct_tasklet_rx, NULL);
379 cvm_oct_taskq = taskqueue_create_fast("oct_rx", M_NOWAIT,
380 taskqueue_thread_enqueue,
382 taskqueue_start_threads(&cvm_oct_taskq, min(mp_ncpus, MAXCPU),
383 PI_NET, "octe taskq");
386 void cvm_oct_rx_shutdown(void)
388 panic("%s: not yet implemented.", __func__);